Role of small amount of MgO and ZrO2 on creep behaviour of high purity Al2O3 |
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Authors: | L N Satapathy S Swaroop |
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Affiliation: | (1) Ceramic Technological Institute, Bharat Heavy Electricals Ltd., IISc Post, 560 012 Bangalore, India;(2) Department of Metallurgy, Indian Institute of Science, 560 012 Bangalore, India |
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Abstract: | Small levels of various dopants have a significant effect on creep in polycrystalline alumina. While most previous studies
have examined the effect of ionic size, the influence of valency of dopants on creep has not yet been completely characterized.
The present detailed experimental study, utilizing magnesia and zirconia with a similar ionic size, demonstrates that the
ionic valency of dopants also plays a crucial role in creep since magnesia does not significantly alter creep whereas zirconia
retards creep substantially. Magnesia doped alumina deforms by Coble diffusion creep whereas zirconia doped alumina deforms
by an interface controlled diffusion creep process. |
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Keywords: | Alumina zirconia magnesia creep dopant |
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